CV_CAP_PROP_SUPPORTED_PREVIEW_SIZES_STRING property is not supported
by all VideoCapture backends. Some backends can return 0.0 or -1.0.

Conflicts:
	modules/java/generator/src/cpp/VideoCapture.cpp

New version of Java wrappers' generator uses different wrappers for VideoCapture
on Android and desktop to prevent binary compatibility issues.

It increases performance on some devices like Nexus4.
Target Android SDK version increased up to 14.

Conflicts:
	modules/core/include/opencv2/core/cuda.hpp
	modules/cudacodec/src/thread.cpp
	modules/cudacodec/src/thread.hpp
	modules/superres/perf/perf_superres.cpp
	modules/superres/src/btv_l1_cuda.cpp
	modules/superres/src/optical_flow.cpp
	modules/videostab/src/global_motion.cpp
	modules/videostab/src/inpainting.cpp
	samples/cpp/stitching_detailed.cpp
	samples/cpp/videostab.cpp
	samples/gpu/stereo_multi.cpp

Now the features2d class wrappers use composition instead of inheritance.

- enable auto-wrap of VideoCapture;
- minor refactoring of generated code templates.

OpenCV Version 2.4.6;
OpenCV Manager Version 2.8;
Doc fixes.

Simple set of the camera index to allow the user to change it after the object has been initialized.

A modification of the JavaCameraView is needed to avoid a crash when the
app is exited. It is a good practice to remove the callback after the
stopPreview method.

Front/Back camera constants' values changed;
Additional camera facing check added for JavaCameraView.

OpenCV Manager verison incremeneted;
Docs and tests updated accordingly;
COnstant for Manager initialization added.